Q1
What is the body's largest organ?
AThe skin
BThe heart
CThe liver
DThe brain
ICSEClass 9 (ICSE)BiologyCh 13 · Topic 1
Skin - The Jack of All Trades
The skin, the body's largest organ, performs multiple functions including protection, temperature regulation, sensation, and vitamin D synth
Core concept
The skin protects the body from pathogens, physical damage, and harmful UV radiation, acting as a barrier against the external environment.
How it works
The skin regulates body temperature through sweating (cooling) and adjusting blood flow to the skin's surface (warming or cooling).
Why it matters
Skin contains sensory receptors detecting touch, pressure, temperature, and pain, helping us interact safely with our environment.
Key detail
The skin also synthesises vitamin D when exposed to sunlight, essential for bone health and various other bodily functions.
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Quick notes
• The skin is the body's largest organ.
• It protects against pathogens and physical damage.
• It also protects against harmful UV radiation.
• Skin regulates temperature through sweating.
• Blood flow adjustment also helps regulate temperature.
• Skin has sensory receptors for touch, pressure, temperature, pain.
• Skin synthesises vitamin D from sunlight.
• Vitamin D is essential for bone health.